A Press-Fit Anti-Double-Firing Safety Mechanism for a Laparoscopic Linear Cutting Stapler

Abstract

The present invention relates to a pressing type anti-secondary firing safety mechanism for a laparoscopic linear cutting stapler. A locking component is rotatably connected inside a staple cartridge holder; a limiting groove is provided at the bottom of the staple cartridge holder; the locking component is connected to a pressing rod provided at the forward end of the cutter, and the limiting groove is cooperatively connected with a stopper provided on the side of the cutter; the locking component includes a locking portion and an unlocking portion, and the locking portion includes a locking block connected to the inner wall of the staple cartridge holder through an elastic element; that is, when the cutter moves forward, the first inclined surface on the upper part of the pressing rod slides under the lower part of the locking block, so that the cutter moves downward at the same time, and the stopper enters the limiting groove to restrict the cutter from continuing to move forward, realizing locking; an unlocking block provided on the firing block is connected to the unlocking portion to drive the locking block to rotate in the opposite direction, away from the cutter direction, for unlocking. The safety block is released through the firing block. Only after the stapler is used, the safety block is released to restrict the cutter, which can ensure the normal firing of the staple cartridge and prevent repeated firing.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a pressing type anti-secondary firing insurance mechanism for a laparoscopic linear cutting stapler. Background Art

[0002] Laparoscopic cutting staplers are one of the instruments widely used in minimally invasive surgeries, and are mainly used for the resection, transection, and anastomosis of tissues in open surgeries. Existing staplers usually only have an insurance mechanism provided on the driving mechanism to prevent premature firing caused by misoperation of medical staff. After firing, the cutting knife resets, and then the stapler is withdrawn. During this process, if medical staff misjudge that this stapler is in an unfired state and initiate the firing operation again, the cutting knife assembly will cut the already cut tissue again, resulting in serious medical accidents. In addition, when there is no staple cartridge and firing block in the staple cartridge holder, the cutting knife will still be pushed out by the push rod, which may also lead to unexpected situations. Therefore, it is necessary to design an anti-secondary firing insurance mechanism to solve the problems existing in the prior art. Summary of the Invention

[0003] The object of the present invention is to provide a pressing type anti-secondary firing insurance mechanism for a laparoscopic linear cutting stapler to solve the problem of medical accidents caused by misjudging that the staple cartridge is unfired and secondary firing in the prior art.

[0004] The technical solution of the present invention is: a pressing type anti-secondary firing insurance mechanism for a laparoscopic linear cutting stapler, including a firing block and a cutting knife assembly arranged in a staple cartridge holder, the cutting knife assembly including a cutting knife and a push rod for driving the cutting knife to move, characterized in that a locking assembly is rotatably connected in the staple cartridge holder; there is a limiting groove at the bottom of the staple cartridge holder; the locking assembly is connected to a pressing rod arranged at the forward end of the cutting knife, and the limiting groove is connected to a blocking block arranged on the side of the cutting knife;

[0005] The locking assembly includes a locking part and an unlocking part, the locking part including a locking block connected to the inner wall of the staple cartridge holder through an elastic element, which elastically drives the locking block to rotate towards the pressing rod and lock; when the cutting knife moves forward, the pressing rod abuts against the locking block in the locked state and synchronously displaces in a pair of perpendicular preset directions, so that the blocking block enters the limiting groove to limit the cutting knife from continuing to move forward, realizing locking;

[0006] An unlocking block arranged on the firing block is connected to the unlocking part to drive the locking block to rotate in the opposite direction, away from the cutting knife direction, for unlocking.

[0007] Preferably, a first inclined surface is arranged on the pressing rod, and the first inclined surface abuts against the locking block in motion, so that the cutting knife moves downward while moving in the cutting direction

[0008] Preferably, the unlocking portion includes a first dial and a second dial hinged to the nail magazine frame, and the first dial can drive the second dial to rotate in the opposite direction when the first dial rotates.

[0009] Preferably, the first dial wheel is provided with a first lever, and the second dial wheel is provided with a second lever connected to the first lever, and the second dial wheel and the first dial wheel rotate relative to each other through mutual shifting of the first lever and the second lever.

[0010] Preferably, the second wedge-shaped block is provided on the first thumbwheel, and the second wedge-shaped block is provided with a second inclined surface connected to the unlocking block, and the second inclined surface may also be an arc surface;

[0011] Preferably, the locking part further comprises a first connecting block connected to the second thumbwheel, a second connecting block connected to the first connecting block, the locking block is arranged at one end of the first connecting block close to the cutter; the elastic element is connected to the second connecting block. The nail magazine frame is also provided with a force-bearing block connected to the second connecting block, the force-bearing block is arranged on the side opposite to the elastic element, and the force-bearing block controls the rotation stroke of the locking assembly by limiting the position of the second connecting block.

[0012] Preferably, the locking block is provided with a third inclined surface, and the cutter can be slidably connected with the third inclined surface when the cutter moves in the reverse direction, and the third inclined surface can be arc-shaped.

[0013] Preferably, a support block is further provided on the nail magazine rack; a second protrusion is provided on the first connecting block at a side away from the locking block, and the second protrusion is directly above the support block to support it.

[0014] Preferably, the locking assembly, the stopper, and the limiting groove are all symmetrically designed and arranged on both sides of the cutter.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) The safety block is released by the firing block. Only after the stapler is used can the safety block be released to restrict the cutter, thereby ensuring the normal firing of the staple cartridge and preventing repeated firing;

[0017] (2) When there is no firing block in the nail magazine, the cutter can be in a safe state, which also avoids accidents caused by the cutter being pushed out when the nail magazine is empty.

[0018] (3) The present invention has a simple structure and is easy to use, which greatly improves the safety factor of the stapler during use and ensures medical safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1Schematic diagram of the closed state of the stapler applied to the anti-secondary firing safety mechanism of the present invention;

[0021] Figure 2 Schematic diagram of the open state of the stapler applied to the anti-secondary firing safety mechanism of the present invention;

[0022] Figure 3 Schematic diagram of the state of the safety mechanism when unlocked according to the present invention;

[0023] Figure 4 is Figure 3 Enlarged schematic diagram of the structure at position C in

[0024] Figure 5 Schematic diagram of the state of the safety mechanism when locked according to the present invention;

[0025] Figure 6 is Figure 5 Enlarged schematic diagram of the structure at position D in

[0026] Figure 7 Schematic diagram of the locking component according to the present invention;

[0027] Figure 8 Schematic diagram of the cartridge holder according to the present invention;

[0028] Figure 9 is Figure 8 Enlarged schematic diagram of the structure at position E in

[0029] Figure 10 Schematic diagram of the cutter assembly according to the present invention;

[0030] Figure 11 is Figure 10 Enlarged schematic diagram of the structure at position F in

[0031] Figure 12 Schematic diagram of the firing block according to the present invention. Detailed Description of the Invention

[0032] The following combines specific embodiments to further elaborate on the content of the present invention:

[0033] As Figures 1-2 shown, a press-fit anti-secondary firing safety mechanism for a laparoscopic linear cutting stapler, which can be used in a linear cutting stapler. The stapler includes a cartridge assembly and a driving end (not shown in the figure) connected to the cartridge assembly through an adapter 7.

[0034] The staple cartridge assembly comprises: a staple cartridge frame 1 and a staple anvil 2 rotatably connected thereto, and the staple anvil 2 and the staple cartridge frame 1 have at least an open and closed state. The staple cartridge frame 1 is provided with a cutter assembly 3 and a staple cartridge 4, and a firing block 5 is provided at the bottom of the staple cartridge 4; the cutter assembly 3 comprises a cutter 31 and a pusher rod 32 fixedly connected thereto, and the end of the pusher rod 32 away from the cutter 31 is connected to the driving end through the adapter. During suturing, the staple cartridge frame 1 and the staple anvil 2 are closed, and the driving end drives the cutter 31 to move forward through the pusher rod 32, and then the cutter 31 pushes the firing block 5 to move forward, and the firing block 5 fires the suture staples in the staple cartridge 4, and the fired suture staples cooperate with the staple groove 21 provided on the lower surface of the staple anvil 2 to achieve tissue suturing; the cutter 31 cuts the tissue while moving forward; after suturing and cutting are completed, the driving end drives the cutter 31 to move in the opposite direction to the initial position through the pusher rod 32, and the staple cartridge frame 1 and the staple anvil 2 are opened, and the stapler can be taken out. It should be noted that the firing block 5 and the cutter 31 are not fixedly connected, and the cutter 31 can push the firing block 5 to move forward, but when the cutter 31 returns to the initial position, the firing block 5 will not return therewith.

[0035] like Figures 3-11 As shown, a press-fit anti-secondary firing safety mechanism of a laparoscopic linear cutting stapler includes a locking assembly 6 rotatably connected in a staple magazine frame 1; a limiting groove 11 is provided at the bottom of the staple magazine frame 1; the locking assembly 6 is cooperated and connected with a pressure rod 311 provided at the positive end of the cutter 31, and the limiting groove 11 is cooperated and connected with a stopper 312 provided at the side of the cutter 31; the locking assembly 6 includes a locking portion 61 and an unlocking portion 62, the locking portion 61 includes a locking block 612 connected to the inner wall of the staple magazine frame 1 through an elastic element 611, and its elasticity drives the locking block 612 to rotate in the direction of the pressure rod 311 and lock; that is, when the cutter 31 moves forward, the first inclined surface 3111 on the upper part of the pressure rod 311 slides under the locking block 612, so that the cutter 31 moves downward at the same time, and the stopper 312 enters the limiting groove 11, restricting the cutter 31 from continuing to move forward, thereby achieving locking. In this embodiment, a fourth inclined surface 111 can also be provided on the limit groove 11, and the fourth inclined surface 111 plays a role of giving way to the stopper 312, that is, the stopper 312 enters the limit groove 11 along the fourth inclined surface 111, so as to avoid interference between the stopper 312 and the edge of the limit groove 11 when moving downward. In addition, it should be noted that the rod body of the push knife rod 32 is in a suspended state, and when the cutter 31 moves downward, the rod body of the push knife rod 32 is slightly bent, and the degree of bending is small, which can be achieved by the traditional push knife rod 32 structure). The unlocking block 51 provided on the firing block 5 is connected to the unlocking part 62 to drive the locking block 612 to rotate in the opposite direction, away from the direction of the cutter 31, to unlock. Specifically:

[0036] like Figure 7As shown, the unlocking part 61 includes a first dial wheel 621 and a second dial wheel 622 hinged to the nail magazine frame 1. When the first dial wheel 621 rotates, it can drive the second dial wheel 622 to rotate in the opposite direction. In this embodiment, the first dial wheel 621 is provided with a first lever 6211, and the second dial wheel 622 is provided with a second lever 6221 that cooperates with the first lever 6211. Through the mutual movement of the first lever 6211 and the second lever 6221, the first dial wheel 621 and the second dial wheel 622 rotate relative to each other. Of course, the first dial wheel 621 and the second dial wheel 622 can be connected by gear matching or other matching methods, as long as they can achieve relative rotation.

[0037] The second wedge block 6212 is provided on the first dial wheel 621, and the second wedge block 6212 is provided with a second inclined surface 6213 that cooperates with the unlocking block 51. The second inclined surface 6213 can also be an arc surface. When the unlocking block 51 approaches the first dial wheel 621, it slides relative to the second inclined surface 6213, causing the first dial wheel 621 to rotate clockwise, and then the second dial rod 6221 is driven by the first dial rod 6211, causing the second dial wheel 622 to rotate counterclockwise, causing the locking block 612 to rotate away from the cutter 31, thereby achieving unlocking.

[0038] The locking part 61 also includes a first connecting block 613 connected to the second dial wheel 622, a second connecting block 614 connected to the first connecting block 613, and a locking block is arranged at one end of the first connecting block 613 close to the cutter 31; and the elastic element 611 is connected to the second connecting block 614. The nail magazine frame 1 is also provided with a force block 13 cooperating with the second connecting block 614. The force block 13 is arranged on the side opposite to the elastic element 611, and controls the rotation stroke of the locking assembly 6 by limiting the position of the second connecting block 614. At the same time, the force block 13 generates a supporting force on the locking block 612 through the second connecting block 614, so that during the forward movement and locking of the cutter 31, the friction force of the pressure rod 311 on the locking block 612 is too large, resulting in failure. In this embodiment, the elastic element 611 can be a spring, a spring, an elastic rubber, etc. The elastic element 611 may be fixedly connected to the second connecting block 614 , or may be fixedly connected to the inner wall of the nail magazine rack 1 , so as to generate a driving force for the second connecting block 614 to rotate in a clockwise direction.

[0039] The lock block 612 is provided with a third inclined surface 6121, and the cutter 31 can slide with the third inclined surface 6121 when the cutter 31 moves in the reverse direction, that is, when the cutter 31 moves in the reverse direction, the lock block 612 is conveniently pushed to both sides by the third inclined surface 6121, and the outer walls on both sides contact and slide with the lock block 612. The third inclined surface 6121 can be arc-shaped.

[0040] In this embodiment, after the stapler is used or when the firing block 5 and the staple cartridge 4 are not installed in the staple cartridge rack 1, Figures 5-6As shown, the firing block 5 is away from the initial position (or not within the staple cartridge holder). Under the action of the elastic element 611, the locking block 612 and the second dial 622 are pushed to rotate clockwise through the second connecting block 614 until the second connecting block 614 contacts the force-receiving block 13. At this time, the locking block 612 moves above the pressure lever 311, that is, the locking assembly 6 is in a locked state. While the second dial 622 rotates, the first lever 6211 is toggled through the second lever 6221, and the first dial 621 rotates counterclockwise.

[0041] If the stapler needs to be removed, the cutter 31 can move in the reverse direction and return to the initial position. During the reverse stroke of the cutter 31, although the locking block 612 is on its stroke path, it can smoothly return through the sliding fit with the third inclined surface 6121. After the cutter 31 reversely returns to the initial position, the anvil 2 and the staple cartridge holder 1 can be opened to remove the stapler.

[0042] If the operator makes an operation error and starts the stapler again when the cutter 31 moves in the reverse direction to the initial position, the cutter 31 moves in the forward direction. The pressure lever 311 moves in the forward direction below the locking block 612. The first inclined surface 3111 contacts the locking block 612 and drives the cutter 31 to gradually move downward while continuing to move in the forward direction until the stop block 312 enters the limit groove 12 along the fourth inclined surface 121 and is blocked by the limit groove 12. Thus, the cutter 31 cannot continue to move in the forward direction, that is, the stapler cannot be started again, realizing the anti-secondary firing of the stapler.

[0043] When replacing the staple cartridge 4 of the stapler, as Figures 3-4 shown, the firing block 5 and the staple cartridge 4 are pushed into the staple cartridge holder 1 in the reverse direction. Under the relative sliding of the unlocking block 51 and the second inclined surface 1122, the first dial 621 is driven to rotate clockwise, thereby driving the second dial 622 to rotate counterclockwise. The locking block 612 rotates counterclockwise accordingly, and the elastic element 611 is compressed. At this time, the locking block 612 is away from the pressure lever 311 (on both sides of the stroke path of the cutter 31), that is, the locking assembly 6 is in an unlocked state. In this state, the forward movement of the cutter 31 is not restricted.

[0044] Among them, the locking assembly 6, the limit groove 12, the stop block 312, etc. are all symmetrically designed and are respectively on both sides of the running path of the cutter 31. For the convenience of explaining the above-mentioned clockwise rotation and counterclockwise rotation, they are all for the components on one side, that is, the side at A as shown in the figure. The rotation direction of the symmetric side at B is opposite and will not be described repeatedly here.

[0045] A support block 14 is further provided on the staple cartridge holder 1; a second protrusion 6131 is provided on one side of the first connection block 613 away from the locking block 612. The second protrusion 6131 is directly above the support block 14 to support it. The functions of the second protrusion 6131 and the support block 14 are as follows: when the locking block 612 presses down on the pressure lever 311, a force for reverse rotation will be generated on the locking block 612. The reverse rotation force is offset by the support block 14 to ensure the stability of anti-secondary firing.

[0046] In actual use, the length of the protruding pressure lever 311 at the front end of the cutter 31 is relatively long, and the ridge 52 in the middle of the firing block 5 can be cut off to make way for the pressure lever 311.

[0047] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler, comprising a firing block and a cutter assembly arranged in a cartridge holder. The cutter assembly includes a cutter and a cutter - pushing rod for driving the cutter to move, and is characterized in that, A locking assembly is rotatably connected in the nail magazine frame; a limiting groove is provided at the bottom of the nail magazine frame; the locking assembly is connected to a pressure rod provided at the positive end of the cutter, and a stopper is provided on the side of the cutter; The locking assembly comprises a locking part and an unlocking part, wherein the locking part comprises a locking block connected to the inner wall of the nail magazine frame through an elastic element, and the locking block is elastically driven to rotate in the direction of the pressure rod and lock; the pressure rod moves against the locking block in the locked state, and simultaneously displaces in a pair of vertical preset directions, so that the block enters the limit groove, restricts the movement of the cutter in the cutting direction, and realizes locking; wherein the pressure rod is provided with a first inclined surface, and the first inclined surface moves against the locking block, so that the cutter moves in the cutting direction and moves downward at the same time; The unlocking block provided on the firing block is connected to the unlocking part to drive the locking block to rotate in the opposite direction, away from the cutter, to unlock; wherein, the firing block and the cutter are not fixedly connected, and the cutter can push the firing block to move forward, but when the cutter returns to its initial position, the firing block will not return therewith.

2. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 1, characterized in that: The unlocking portion includes a first dial and a second dial hinged to the nail magazine frame, and the first dial can drive the second dial to rotate in the opposite direction when the first dial rotates.

3. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 2, characterized in that: The first dial wheel is provided with a first lever, and the second dial wheel is provided with a second lever connected with the first lever. The second dial wheel and the first dial wheel rotate relative to each other through mutual shifting of the first lever and the second lever.

4. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 2, characterized in that: The second wedge block is arranged on the first thumbwheel, and the second wedge block is provided with a second inclined surface connected with the unlocking block, and the second inclined surface can also be an arc surface.

5. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 2, characterized in that: The locking part further comprises a first connecting block connected to the second thumbwheel, a second connecting block connected to the first connecting block, the locking block being arranged at one end of the first connecting block close to the cutter; the elastic element is connected to the second connecting block; The nail magazine frame is also provided with a force-bearing block connected to the second connecting block. The force-bearing block is arranged on a side opposite to the elastic element. By limiting the position of the second connecting block, the rotation stroke of the locking assembly is controlled.

6. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 2, characterized in that: The locking block is provided with a third inclined surface, and the cutter can be slidably connected with the third inclined surface when the cutter moves in the reverse direction, and the third inclined surface can be arc-shaped.

7. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 5, characterized in that: A support block is also provided on the nail magazine frame; a second protrusion is provided on the side of the first connecting block away from the locking block, and the second protrusion is directly above the support block to support it.

8. The pressing type anti - secondary - firing safety mechanism for a laparoscopic linear cutting stapler according to claim 1, characterized in that: The locking assembly, the stopper and the limiting groove are all symmetrically designed and arranged on both sides of the cutter.

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